density prior logic bug in map_cells_to_space

[brainfo]

https://github.com/broadinstitute/Tangram/blob/master/tangram/mapping_utils.py around line 287

    # define density_prior if 'rna_count_based' is passed to the density_prior argument:
    d_str = density_prior
    if type(density_prior) is np.ndarray:
        d_str = "customized"

    if density_prior == "rna_count_based":
        density_prior = adata_sp.obs["rna_count_based_density"]

    # define density_prior if 'uniform' is passed to the density_prior argument:
    elif density_prior == "uniform":
        density_prior = adata_sp.obs["uniform_density"]

apparently line 287 should also be elif,

    elif density_prior == "rna_count_based":

current if, will throw error when type(density_prior) is np.ndarray